This is the 7590th most frequent French word.
raison
Reason; cause or justification.
Used to indicate correctness or being right in a statement.
J'ai raison quand je dis que cette solution fonctionne.
I am right when I say this solution works.
Used to denote the cause or explanation behind something.
La raison de son absence est qu'il est malade.
The reason for his absence is that he is ill.
Used to refer to rationality or sound judgement.